<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
<h1>修改</h1>
    <input v-model="product.id" placeholder="商品id" readonly><br>
    <input v-model="product.title" placeholder="商品名字"><br>
    <input v-model="product.price" placeholder="商品价格"><br>
    <input v-model="product.num" placeholder="商品库存"><br>
    <input type="button" value="修改" @click="update()">
</div>

     <script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
        <script src=" https://cdn.staticfile.org/vue/2.2.2/vue.min.js"></script>
          <script>
            let v=new Vue({
              el:"body>div",
              data: {
                  product: {
                      id:"",
                      title: "",
                      price: "",
                      num: ""
                  },
              },
              methods:{
                  update(){
                      axios.post("/update",v.product).then(function (response) {
                          alert("修改完成");
                          location.href="/list.html"
                      })
                  }
              },
                created:function (){
                  axios.get("/selectByid"+location.search).then(function (response) {
                      v.product=response.data;
                  })
                }
            })

          </script>
</body>
</html>